Antislipping device



March 13, 1928.

I R.R.HALSTEAD ANTISLIPPING DEVICE Filed April 4. 1927 Inventor 7?. P. 25782 660? Patented Mar. 13, 1928.

UNITED STATES RICHARD R. HALSTEAD, OF BEACH, NORTH DAKOTA.

ANTISLIPPING DEVICE.

Application filed April 4, 1927. Serial No. 180,905.

The present invention relates to improvements in anti-slipping devices, for association with shoes and'has for its principal object to provide a simple and efiicient device which is attached to the heel ofthe shoe, the same including a plurality of ground engaging calks which protrude below the bottom surface of the heel, whereby the wearer will not slip on icy or muddy surfaces, while walking over the same.

Another important object of the invention is to provide an anti-slipping device of the above mentioned character, which includes a means for simultaneously actuating all of the ground engaging calksfor moving the same to anoperative or inoperative position.

A further object is to provide an antislipping device of the above mentioned character, which may be associated with a shoe heel in such a manner as not to present an unsightly appearance. 1

A still further ob'ect is to provide an antislippingof the above mentioned character, which is simple in construction, strong and durable, and further well adapted to the purpose for which it is designed.

Other objects and advantages of the in.- vention will become apparent during the course of the following detailed description,

taken in connection with the accompanying drawings, forming a part of this applica-' tion.

In the drawing:

Figure 1 is a bottom plan view of the anti-slipping device embodying my invention.

Figure 2 is a longitudinal sectional view, taken approximately on the line 2-2 of Figure 1, for more clearly disclosing the construction of the worm shaft.

Figure 3 is a sectional view, taken approximately on the line 3-3 of Figure 1, looking in the direction of the arrows.

Figure 4 is a detail perspective View of one of the ground engaging calks.

Figure 5 is an enlarged vertical sectional view, through the calk showing the hardened center, and

Figure 6 is a detail perspective view of the sleeve and the worm wheel carried by the upper end thereof.

In the drawing, wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates generally my improved antislipping device, the same comprising a substantially rectangular shaped block or casmg 2 and extending longitudinally therein adjacent one side thereof is the rotatable shaft 3, the same being formed at spaced intervals with the worms l. In the present instance, three of such worms are disclosed, although it is to be understood that I donot wish to limit myself to the particular number which may be provided. The purpose of these worms will hereinafter be more fully described.

A head 5 is formed on one end of this shaft 3 and engages one end of the casing or block 2. The other end of the shaft car rics thereon a suitable thumb engaging member 6, whereby the shaft may be actuated.

Also forming a part of the present in-- vention are the depending relatively short housings 7, the upper end of each housing being formed with an attachingflange 8, which is adapted to be secured to the bottom ofthe block or casing 2, by any appropriate fastening means, such as are shown at 9. Each housing is provided with an internally threaded bore, and arranged for vertical movement within each housing is the externally threaded calk 10. The lower end of each calk is pointed as at 11, to provide a sharp ground engaging element, and as is more clearly shown in Figure 5, the center of each calk is hardened, and the hardened portion is indicated by the numeral 12.

By constructing the ground engaging calk with a center core of nickel chrome steel and the outer portion of the softer steel, this element or member will not be apt to break and furthermore the point 11 will wear sharp, instead of dull.

The calk 10 is formed at its upper end with an elongated shank 13, and the same is substantially rectangular in cross section, for a purpose to be presently apparent.

Removably fitted on each of the rectangular shaped shanks 13 isthe relatively short sleeve 14, the bore thereof being also reccalk being of, a

tangular for cooperation with the rectan that all of the sleeves of the heel in which the anti-slipping device is embedded or otherwise arranged. FInorder to prevent any possibility of a person slipping on an icy or unuddy surface, it is only necessary to turn the thumb engaging member 6,inlo11edirection, so that the shaft 3 isfrotated, and as this shaft is rotated, the Worms 4 will cooperate with the worm wheels 15 to rotate the sleeves 14. As the bores of thesleeves are rectangular and receivelthe' rectangular shanks 13 of the calks 10, 'the latter will be threaded outwardly of theiinternally threaded housings 11, so that the ointed lower endsof the calks will protr11 e beyond the body zface'of the heel and will engage the surface so that the wearer of the device may travel over any icy :or muddy surface without any danger of slipping or falling.

The'simplicity in which my device construeted enablesthe partsto be readily and easilyassembled and furthermm'e all 01'' the calks will be operated simultaneously so-tha t onecalk WlllIlObPl'OtllKlB a greater distance than :the other ".CBlkS.

The anti-slipping device may, be employed on rubbers and overshoes as Well as the ordinary type of shoes. 1

W11 ile I have shown the preferred embodiinvention or (2181111.

meat of my invention, -it is to "be amderstood that various changes in the size, *shape and arrangement of parts may be resorted to without departing from -the spirit of the the scope of the appended What I claim is:

Anianti-slipping-device comprising a casing adapted to be embedded in a shoe heel, a ro tatable shaft extending through the raising, a series of internally "threaded housings adapted "to be embedded in a .:hoe Fheel, an attaching *flange :formed on the upper portion of each housing for attachment to Pthe bottom otthe casing, :an externally threaded calk arranged within each internally threaded fhousing, thelower end ofeach calkbcing pointed for engagement with fthcground, a rectangular shank formedon the upper end of'each ealkrand extending into the casing, a plurality of sleeves arranged in the casing directly above the respective housings, the bore of :each sleeve being rectangular :for receiving the rectangularshank of "the respective calk, zthe shank :heing slidable in the sleeve, a worm wheel formed on :the upperiportionof each sleeve, said -sha'ft being formed with :a series of worms for cooperation with the respective Worm wheels whereby the calks may be raised or lowered when thesshaft isactuated.

In testimonywvhereo'f I aflix mysignaturc.

RICHARD R. HA'IJSTEND. 

